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v3.19.1

Short Term Debt (short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity) (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Short term debt revolving and non revolving credit facility [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,065 | $ 2,024
Credit Facility Advances | 1,186 | 1,241
Letters of Credit Outstanding, Amount | 3 | 3
Total advances under available facilities | 1,189 | 1,244
Available capacity under existing agreements | 876 | 780
TECO Energy Inc. and TECO Finance Inc. [Member] | Revolving Credit Facility [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 546 | 376
Line of Credit Facility, Expiration Date | Mar. 22, 2022 |
TECO Energy Inc. and TECO Finance Inc. [Member] | Finance Term Credit Facility [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 682 | 502
Line of Credit Facility, Expiration Date | Mar. 22, 2019 |
Tampa Electric Division [Member] | Revolving Credit Facility [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 443 | 408
Line of Credit Facility, Expiration Date | Mar. 22, 2022 |
Tampa Electric Division [Member] | Accounts Receivable Revolving Credit Facility |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 205 | 188
Line of Credit Facility, Expiration Date | Dec. 31, 2021 |
Tampa Electric Division [Member] | Finance Term Credit Facility [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 0 | 377
Line of Credit Facility, Expiration Date | Dec. 31, 2018 |
New Mexico Gas Company [Member] | Revolving Credit Facility [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 171 | 157
Line of Credit Facility, Expiration Date | Mar. 22, 2022 |
Grand Bahama Power Company Limited [Member] | Revolving Credit Facility [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 18 | $ 16
Line of Credit Facility, Expiration Date | Dec. 31, 2019 |

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- Definition Advances against the line of credit facility which can be made by way of overdraft. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowed funds under the facility. + References No definition available. + Details
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Namespace Prefix: | ema_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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